scsi: scsi_debug: Add new error injection type: Reset LUN failed

scsi: scsi_debug: Add new error injection type: Reset LUN failed

Add error injection type 4 to make scsi_debug_device_reset() return FAILED.
Fail abort command format:

  +--------+------+-------------------------------------------------------+
  | Column | Type | Description                                           |
  +--------+------+-------------------------------------------------------+
  |   1    |  u8  | Error type, fixed to 0x4                              |
  +--------+------+-------------------------------------------------------+
  |   2    |  s32 | Error count                                           |
  |        |      |  0: this rule will be ignored                         |
  |        |      |  positive: the rule will always take effect           |
  |        |      |  negative: the rule takes effect n times where -n is  |
  |        |      |            the value given. Ignored after n times     |
  +--------+------+-------------------------------------------------------+
  |   3    |  x8  | SCSI command opcode, 0xff for all commands            |
  +--------+------+-------------------------------------------------------+

Examples:

    error=/sys/kernel/debug/scsi_debug/0:0:0:1/error
    echo "4 -10 0x12" > ${error}

will make the device return FAILED when trying to reset LUN with inquiry
command 10 times.

    error=/sys/kernel/debug/scsi_debug/0:0:0:1/error
    echo "4 -10 0xff" > ${error}

will make the device return FAILED when trying to reset LUN 10 times.

Usually we do not care about what command it is when trying to perform
reset LUN, so 0xff could be applied.

Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>
Link: https://lore.kernel.org/r/20231010092051.608007-9-haowenchao2@huawei.com
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>